A：I cannot understand why she always helps and supports her brother.
我真不明白她为何总是帮着她的弟弟说话，支持着她弟弟。
B：Why do you say so?
为什么这么说?
A：Because he is often in trouble.
因为他弟弟总是麻烦不断。
B：She has promised her mother that she would be with him through thick and thin.
她答应过自己的母亲，她将和她弟弟同甘共苦。
A：Oh, I see.
哦，我明白了。